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Derivative and Hedging Activities - Additional Information (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
counterparty
instrument
Dec. 31, 2019
USD ($)
instrument
Derivative [Line Items]    
Amounts reclassified from AOCI to Income $ 3,700,000  
Number of counterparties | counterparty 4  
Derivatives Not Designated as Hedging Instrument    
Derivative [Line Items]    
Credit derivatives, fair value $ 97,000 $ 47,323
Derivative liabilities 116,200,000  
Collateral against obligations $ 113,600,000  
Designated as Hedging Instrument    
Derivative [Line Items]    
Number of derivative liability instruments held | instrument 14  
Aggregate notional amount for derivative liability $ 600,000,000.0  
Interest Rate Products | Derivatives Not Designated as Hedging Instrument    
Derivative [Line Items]    
Number of derivative instruments held | instrument 172 92
Aggregate notional amount $ 2,630,000,000 $ 1,610,000,000
Credit Risk Contract | Derivatives Not Designated as Hedging Instrument    
Derivative [Line Items]    
Number of derivative instruments held | instrument 13  
Aggregate notional amount $ 121,700,000 $ 106,000,000.0
Amount of collateral $ 650,000